Wither Skeleton

If you venture into The Nether, you may find a Wither Skeleton. It is part of Pretty Scary Update 1.4.2. Wither Skeletons only spawn in Nether Fortresses. There is no Spawn Egg for this mob in the creative inventory, and there are no natural spawners of this mob.

Wither skeleton mobs attack with swords, and they can perhaps be mistaken for a more standard skeleton that slipped and fell in a pool of ink. The whither skeletons are also slightly taller than you or a normal skeleton. If you take damage from the foe, you'll slowly lose your health thanks to the "wither" effect.